Quasi-perfect and wideband absorption with gradient non-uniform micro-slit array absorber via a hierarchical optimization method

Liao, Wei‐Wei; Hu, Run; Xing, Guanying; Luo, Xin

doi:10.1016/j.apacoust.2023.109321

Applied Acoustics

2023

DOI: 10.1016/j.apacoust.2023.109321

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Quasi-perfect and wideband absorption with gradient non-uniform micro-slit array absorber via a hierarchical optimization method

Wei‐Wei Liao

Run Hu

Guanying Xing

et al.

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Cited by 2 publications

References 34 publications

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Metamaterial based on labyrinthine tubes loaded periodically and ultra-low phase velocity to the low-frequency energy control

Almeida,

Vergara,

Lenzi

2023

Applied Physics Letters

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Sound energy control at low frequencies (≤1000 Hz) is necessary and very important in acoustics, especially when considering scientific and technological aspects. In this work, a modular acoustic metamaterial composed of a main waveguide loaded with small quarter-wavelength tubes is presented. Theoretical, numerical, and experimental methods are used to describe the accumulation of sound absorption peaks below the structure's bandgap with the number of peaks proportional to the structure's periodicity. The origin of the bandgap is due to the loaded tubes in the main waveguide. Ultra-low phase velocity (c̃p=16 m/s) and critical coupling were obtained in the model, which allowed perfect sound absorption at 292 Hz with a structure reaching a ratio of λ/90. The experimental results in the impedance tube support the theoretical and numerical discussions and demonstrate a sound energy control of 89% and 84% at 686 and 422 Hz, respectively. Finally, this work contributes to advances in the field of control and manipulation of low-frequency sound energy through periodic structures.

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Metamaterial based on labyrinthine tubes loaded periodically and ultra-low phase velocity to the low-frequency energy control

Almeida,

Vergara,

Lenzi

2023

Applied Physics Letters

View full text Add to dashboard Cite

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A sound insulation cooling fin for broadband noise control and ventilation

Liao,

Hao,

Luo

2024

J. Phys. D: Appl. Phys.

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The noise generated by the ultrathin centrifugal fan in a laptop can significantly impact user comfort. While optimizing the fan itself for noise control is important, addressing noise propagation is also crucial. Due to space limitations inside a laptop, adding an extra component for noise control is nearly impossible. Therefore, modifying the cooling fin outside of the fan outlet for sound insulation can be an effective solution. A sound insulation cooling fin is proposed to provide broad noise insulation while maintaining proper ventilation. Through the introduction of a coupled area change passage, noise at specific frequencies at the passage outlet can be managed to be insulated due to the destructive interference. The effectiveness of the unit's sound insulation is verified through an impedance tube measurement. Moreover, combining different units can create a multi-peak sound insulation effect which is suitable for various noise conditions. To meet the demand of real situations, a reversal design flow combining neural network and nonlinear constrained optimization algorithm is developed. As a result, a sound cooling fin combing 2 sound insulation units featuring 4013 Hz and 6000 Hz is fabricated and the actual insulation performance is measured in an anechoic chamber. The sound transmission loss at the designed frequency range reaches 5 dB, aligning well with the simulation results. The sound insulation cooling fin has the potential to be widely used for noise control in small-scale electronic devices.

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Quasi-perfect and wideband absorption with gradient non-uniform micro-slit array absorber via a hierarchical optimization method

Cited by 2 publications

References 34 publications

Metamaterial based on labyrinthine tubes loaded periodically and ultra-low phase velocity to the low-frequency energy control

Metamaterial based on labyrinthine tubes loaded periodically and ultra-low phase velocity to the low-frequency energy control

A sound insulation cooling fin for broadband noise control and ventilation

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